How to convert Input Stream to bytes array?

[Unni Nair]

Hi ,
I was trying to convert a Input Stream data to a byte array but was not sure , how to proceed. Please help me if you know the best way to get this done

[horace1]

you can use InputStream to read an array of bytes, e.g.

http://download.oracle.com/javase/1.4.2/docs/api/java/io/InputStream.html

if you are having problems post your code

[Unni Nair]

this is the code I am using
java.io.File file = new java.io.File("M yFile.txt");//add a file
int fileLength = (int) file.length();
System.out.prin tln("fileLength of asciifile.txt is "+fileLengt h);// create an input stream


try {
fin = new java.io.FileInp utStream(file);
} catch (FileNotFoundEx ception e1) {
System.out.prin tln("error !!File Not Found");
throw (new SQLException("e rror !!File Not Found"));
}


I want to convert this 'fin' object to a byte array
the link that you gave me is not opening

[horace1]

strange the link works OK for me
you use it so

java.io.File file = new java.io.File("test.txt");//add a file

try {
    java.io.FileInputStream fin = new java.io.FileInputStream(file);
    byte data[]=new byte[100];
    int size=fin.read(data,0,100);
    for (int i=0; i<size; i++)
     System.out.print(data[i] + " ");
    } 
    catch (FileNotFoundException e1) 
       { System.out.println ("error !!File Not Found");}
    catch (IOException e1) {System.out.println("error !!" + e1);}

if test.txt is

abcdef
xyz

the program gives

97 98 99 100 101 102 10 120 121 122 10

which are the ASCII codes for the above characters (10 being the RETURN character)

[Unni Nair]

the problem here is that my file size is 12994 bytes
and when I use this code
try {
fin = new java.io.FileInp utStream(file);

byte data[]=new byte[12994];
int size=fin.read(d ata);
for (int i=0; i<size; i++)
System.out.prin t(data[i] + " ");

} catch (FileNotFoundEx ception e1) {
System.out.prin tln("error !!File Not Found");
throw (new SQLException("e rror !!File Not Found"));
}



I see the output as:
just a blank

[horace1]

I tried the following with a .exe file

java.io.File file = new java.io.File("t.exe");//add a file
int fileLength = (int) file.length();
System.out.println("fileLength of asciifile.txt is "+fileLength);// create an input stream
try {
    java.io.FileInputStream fin = new java.io.FileInputStream(file);
    byte data[]=new byte[fileLength];
    int size=fin.read(data,0,fileLength);
    System.out.println("size is " + size);
    for (int i=0; i<size; i++)
     System.out.print(data[i] + " ");
    } 
    catch (FileNotFoundException e1) 
       { System.out.println ("error !!File Not Found");}
    catch (IOException e1) {System.out.println("error !!" + e1);}
}

and the output was

fileLength of asciifile.txt is 25264
size is 25264
77 90 -112 0 3 0 0 0 4 0 0 0 -1 -1 0 0 -72 0 0 0 0 0 0 0 64 0 0 0 0 0   .......

I cut short the line of bytes as it printed 25264 values

[Unni Nair]

Thank you that worked for me , for a file of smaller size !!

[Unni Nair]

do you know how I can generate this byte array with the ccsid of 37?

[horace1]

have a look at the EBCDIC 37 page

http://en.wikipedia.org/wiki/EBCDIC_037